最大的限制是，本机堆和所有线程栈都保存在分段 2 中。
The most significant restriction is that the native heap and all thread stacks are held in segment 2.
在大内存模型中，本机堆从分段3开始；分段2仅用于原始(初始)线程栈。
In the large memory model, the native heap starts at segment 3; segment 2 is only used for the primordial (initial) thread stack.
这些JMSTopicConnection对象也占用了大量的本机堆资源。
These JMSTopicConnection objects were also holding up significant amount of native heap resources.
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